EP0280514A1 - Voltage regulator and voltage stabilizer - Google Patents
Voltage regulator and voltage stabilizer Download PDFInfo
- Publication number
- EP0280514A1 EP0280514A1 EP88301542A EP88301542A EP0280514A1 EP 0280514 A1 EP0280514 A1 EP 0280514A1 EP 88301542 A EP88301542 A EP 88301542A EP 88301542 A EP88301542 A EP 88301542A EP 0280514 A1 EP0280514 A1 EP 0280514A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- terminal
- voltage
- transistor
- circuit
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/571—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
Description
- The present invention relates to a voltage regulator, for instance for a voltage stabilizer comprising a monolithically integrated regulator circuit for use in motor vehicle applications, and to a voltage stabilizer.
- Voltage stabilizers supply, from a supply voltage whose value is not defined, a voltage with a well defined and constant value or values. Voltage stabilizers may be advantageously used as supply devices for other devices: as a function of the load connected thereto they in fact supply the current needed to keep the voltage applied to this load constant. At present, for reasons of compactness, ease of use and economic viability, integrated circuit electronic voltage stabilizers are tending to be constructed for all types of application.
- In general, the electrical magnitudes of voltage and current at the output terminals of these electronic voltage stabilizers are determined by an internal regulation circuit which is monolithically integrated and comprises circuit feedback means connected to the output terminals and sensitive to the instantaneous value of these electrical magnitudes. The lower limit of the correct operating range of an electronic voltage stabilizer is pinpointed by a parameter known in general in the technical literature by the term "drop-out", i.e. the difference between the minimum value of the input voltage required for the correct operation of the stabilizer and the value of the constant voltage which the stabilizer has to supply as output, which is thus the voltage drop across the device.
- Voltage stabilizers used in motor vehicle applications must satisfy particularly strict requirements as a result of operating conditions which entail major variations in temperature and humidity as well as considerable, and in some cases abrupt, variations in the supply voltage generated by the battery of the vehicle. These stabilizers must therefore be extremely reliable, accurate and stable, while still being economically viable, and must in particular have a low drop-out since the supply voltage supplied by the battery of a vehicle may normally drop, during cold starting, from a typical 14.4 V at full charge to approximately 6 V. Account must also be taken of the positive and negative voltage peaks with a maximum amplitude of up to 150 V which may be present on the supply line of a vehicle as a result of the switching transients of the inductive loads (starter solenoids, relays, etc.) or of disconnections or breakages of electrical connection cables.
- The monolithically integrated voltage regulator circuits most commonly used in voltage stabilizers for motor vehicle applications are those with "series" type regulation, in which the output voltage is regulated to a constant value by a bipolar power transistor connected in series between input and output terminals of the stabiliser. The base of the transistor is appropriately controlled to cause it to conduct as a function of the load. A suitably dimensioned power transistor can also withstand, without drawbacks, positive voltage peaks having a high amplitude and may thus continue to ensure the regulation of the output voltage.
- Negative peaks in the input voltage could, however, cause the transistor to be cut off, with interruptions, albeit brief, in the supply to the user circuits connected to the voltage stabilizer, with serious drawbacks when these comprise memories and integrated logic circuits which require a constant supply. For this reason voltage stabilizers comprising "series" type regulation circuits also comprise a capacitor and an input diode, which are not integrated, in order to maintain, during very short negative transients in the input voltage, an adequate supply to the power transistor.
- Figures 1 and 2 of the accompanying drawings show a known voltage stabilizer with "series" type regulation by means of a p-n-p transistor and a known voltage stabilizer with "series" type regulation by means of an n-p-n power transistor, respectively.
- The stabilizer shown in Figure 1 comprises a bipolar transistor T of p-n-p type whose emitter terminal is connected to the cathode of a diode D, whose anode forms an input terminal IN, and to a first terminal of a capacitor C whose second terminal is connected to earth. The collector terminal of the transistor T forms an output terminal OUT. The base terminal of the transistor T is connected to the output terminal of a differential amplifier A whose non-inverting input is connected via a first resistor R1 to the terminal OUT and via a second resistor R2 to earth. The inverting input of the amplifier is connected to receive a reference voltage VR.
- The part of Figure 1 which shows the voltage regulator circuit which can be monolithically integrated has been enclosed in a rectangular block shown in broken lines.
- In the stabilizer shown in Figure 2, the transistor T of p-n-p type is replaced by a bipolar transistor T1 of n-p-n type. The output terminal of the differential amplifier A is not in this case connected directly to the base terminal of the transistor T1 but to the base terminal of a second bipolar transistor T2 of p-n-p type. The emitter and collector terminals of the transistor T2 are connected to the collector terminal and to the base terminal, respectively, of the transistor T1.
- All the other components of the stabilizer are identical to those of Figure 1.
- In both cases the capacitor C is charged via the diode D to the typical value of the batter voltage less the voltage drop across the diode, during normal charging conditions of the battery.
- During negative voltage transients, however, the diode D prevents the discharge of the capacitor C via the input terminal with the result that this capacitor can be discharged only via the transistor of the regulation circuit, enabling its conduction during the transient.
- The two types of voltage stabilizer will now be compared, calculating their drop-out.
- In the case of the stabilizer comprising a power transistor of p-n-p type, the drop-out is:
VDROP = VD + VCEsat
in which VD is the voltage drop across the doide D when it is conducting a VCEsat is the collector-emitter voltage of the transistor T when it is saturated. - In the case, however, of the stabilizer comprising a power transistor of n-p-n type, it is:
VDROP = VD + VCEsat + VBE
in which VD is again the voltage drop across the input diode, VCEsat is the collector-emitter voltage of the transistor T2 when it is saturated, and VBE is the base-emitter voltage of the transistor T1 when it is conducting. - It is thus possible to construct a voltage stabilizer with minimal drop-out using, as shown in Figure 1, a regulation circuit comprising a power transistor of p-n-p type. A voltage stabilizer of the type shown in Figure 2 is, however, economically advantageous since, by using an n-p-n power transistor, it is possible to achieve an overall occupation of integration area of the regulation circuit which is lower than that which can be achieved with a p-n-p power transistor.
- It should be noted that, with the voltage stabilizers examined above and with equal current supplied to the load, it is generally necessary to insert an external capacitor between the output terminal OUT and earth in order to stabilize the regulation loop during operation. If use is made of an n-p-n power transistor, this provides a regulation loop with a gain which is lower than that which can be achieved with a p-n-p power transistor so that it is possible to use an output capacitor having a lower capacitance which is thus less costly. Since the production level of devices for use with motor vehicles is very high, these economic advantages are fairly substantial.
- According to the invention, there is provided a voltage regulator circuit as defined in the appended
Claim 1. - Preferred embodiments are defined in the other appended claims.
- It is thus possible to provide a voltage stabilizer device with minimal drop-out designed to withstand high voltage transients, which is economically advantageous with respect to similar known voltage stabilizers.
- The invention will be further described, by way of non-limiting example, with refernce to the accompanying drawings, in which:
- Figure 1 is a diagram, described above, of a known voltage stabilizer circuit with a "series" type regulation circuit comprising a p-n-p power transistor;
- Figure 2 is a diagram, described above, of a known voltage stabilizer circuit with a "series" type regulation circuit comprising an n-p-n power transistor; and
- Figure 3 is a circuit diagram showing a voltage stabilizer constituting a preferred embodiment of the invention.
- The same reference letters and numerals are used in the figures for corresponding components.
- The voltage stabilizer shown in Figure 3 comprise a bipolar transistor Tʹ1 of n-p-n type whose collector terminal is connected to the cathode of a diode Dʹ and to a first terminal of a capacitor Cʹ whose second terminal is connected to earth.
- The stabilizer also comprises first and second bipolar transistors Tʹ2 and Tʹ3 of p-n-p type whose collector terminals are connected to the base terminal of the transistor Tʹ1. The emitter terminal of the transistor Tʹ2 is connected to the cathode of the diode Dʹ and the emitter terminal of the transistor Tʹ3 is connected to the anode of the diode Dʹ at a circuit node which forms an input terminal INʹ of the stabilizer. The emitter terminal of the transistor Tʹ1 forms an output terminal OUTʹ. The transistor Tʹ1 is a power transistor; the diode and the capacitor are discrete components.
- The base terminal of the transistor Tʹ1 is connected to the output terminal of a differential amplifier Aʹ whose inverting input is connected to the output terminal OUTʹ via a first resistor Rʹ1 and to a common terminal GNDʹ via a second resistor Rʹ2. The common terminal GNDʹ is connected to earth. The non-inverting input of the differential amplifier is connected to receive a reference voltage VʹR.
- The base terminal of the transistor Tʹ2 is connected to the common terminal GNDʹ via a first constant current generator Gʹ2 and to the cathode of a diode Dʹ2 whose anode is connected to the emitter terminal of the transistor Tʹ2. The base terminal of the transistor Tʹ3 is connected to the common terminal GNDʹ via a second constant current generator Gʹ3 and to the cathode of a diode Dʹ3 whose anode is connected to the emitter terminal of the transistor Tʹ3.
- As in the other figures, the regulation circuit which can be monolithically integrated has been enclosed in a rectangular block shown in broken lines in Figure 3, and can be constructed and marketed as a monolithically integrated voltage regulator device.
- The transistors Tʹ2 and Tʹ3 may be electrically and physically identical.
- In normal operating conditions, when the voltage supplied to the input terminal is sufficiently high, both transistors Tʹ2 and Tʹ3 can conduct. The drop-out of the voltage stabilizer therefore has the value:
VDROP = VBE + VCEsatʹ
in which VBE is the base-emitter voltage of the transistor Tʹ1 in conduction, with a value approximately equal to the voltage drop VD across a diode, and VCEsatis the collector-emitter voltage of the transistor Tʹ3 when it is saturated and is thus equal to the minimum drop-out which can be obtained with a stabilizer of the type shown in Figure 1. - However, when an input negative voltage peak occurs, the transistor Tʹ3 automatically cuts off as a result of the biasing conditions at its terminals and the supply of the transistor Tʹ1 comes exclusively from the transistor Tʹ2 which continues to conduct as a result of the presence of the capacitor C1 and the diode Dʹ which prevents its discharge at the input. Since it remains cut off during the voltage transient, the p-n-p transistor Tʹ3 can withstand the inverse overvoltage at its terminals without the need for any form or protection, particularly if it is constructed as a "lateral" p-n-p transistor.
- Only the transistors Tʹ2 and Tʹ3 have to supply the base current of the power transistor Tʹ1 so that the overall occupation of integration area for the voltage regulator circuit of the voltage stabilizer is undoubtedly less than that of the regulation circuit of the known stabilizer with minimal drop-out shown in Figure 1.
- The voltage stabilizer is thus economically advantageous, since it also makes it possible to use a smaller and less costly output stabilizing capacitor as the power transistor of the regulation loop is of n-p-n type.
- Although a single embodiment of the invention has been described and illustrated, many variations are possible without departing from the scope of the invention. For example, the circuit biasing means formed by the diodes Dʹ2 and Dʹ3 and by the current generators Gʹ2 and Gʹ3 could be replaced by more complex circuit biasing means designed to keep the transistor Tʹ2 in conduction exclusively during the negative transients of the input voltage so as to prevent useless current absorption. These circuit means can be constructed in a manner known to persons skilled in the art.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1945087 | 1987-02-23 | ||
IT19450/87A IT1203335B (en) | 1987-02-23 | 1987-02-23 | MINIMUM VOLTAGE DROP VOLTAGE REGULATOR, SUITABLE TO SUPPORT HIGH VOLTAGE TRANSITORS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0280514A1 true EP0280514A1 (en) | 1988-08-31 |
EP0280514B1 EP0280514B1 (en) | 1991-01-16 |
Family
ID=11158113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88301542A Expired EP0280514B1 (en) | 1987-02-23 | 1988-02-23 | Voltage regulator and voltage stabilizer |
Country Status (5)
Country | Link |
---|---|
US (1) | US4801860A (en) |
EP (1) | EP0280514B1 (en) |
JP (1) | JP2505846B2 (en) |
DE (1) | DE3861520D1 (en) |
IT (1) | IT1203335B (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0316781A1 (en) * | 1987-11-17 | 1989-05-24 | National Semiconductor Corporation | Dual input low dropout voltage regulator |
EP0376665A1 (en) * | 1988-12-28 | 1990-07-04 | STMicroelectronics S.r.l. | Voltage stabilizer |
EP0490432A1 (en) * | 1990-12-11 | 1992-06-17 | Koninklijke Philips Electronics N.V. | Power-supply arrangement |
EP0501418A2 (en) * | 1991-02-27 | 1992-09-02 | STMicroelectronics S.r.l. | Low-fall voltage regulator |
EP0556663A1 (en) * | 1992-02-07 | 1993-08-25 | Power Integrations, Inc. | Below ground current sensing with current input to control threshold |
EP0590764A1 (en) * | 1992-09-30 | 1994-04-06 | Sharp Kabushiki Kaisha | Direct-current stabilizer |
EP0693784A1 (en) * | 1994-06-24 | 1996-01-24 | STMicroelectronics S.r.l. | Safeguard for integrated output power stages employing multiple bond-wires |
EP0731553A2 (en) * | 1991-09-30 | 1996-09-11 | Siemens Aktiengesellschaft | Active harmonic suppressor |
GB2325313A (en) * | 1997-05-12 | 1998-11-18 | Fulleon Ltd | Electronic circuits for removing data signals from DC supply voltage |
GB2346226A (en) * | 1999-01-26 | 2000-08-02 | Nec Corp | Constant voltage power supply |
AT500518A1 (en) * | 2000-05-25 | 2006-01-15 | Hilti Ag | DEVICE AND METHOD FOR GENERATING HIGH VOLTAGE FROM A LOW VOLTAGE SUPPLY SOURCE |
WO2009044326A1 (en) * | 2007-09-30 | 2009-04-09 | Nxp B.V. | Capless low drop-out voltage regulator with fast overvoltage response |
US7928711B2 (en) | 2007-12-11 | 2011-04-19 | Texas Instruments Deutschland Gmbh | Linear voltage regulator with accurate open load detection |
RU2480809C1 (en) * | 2011-10-13 | 2013-04-27 | Открытое акционерное общество "Концерн "Созвездие" | Dc voltage stabiliser |
CN105511544A (en) * | 2016-01-15 | 2016-04-20 | 中山芯达电子科技有限公司 | Adjustable voltage stabilizing circuit |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE231251T1 (en) * | 1995-07-14 | 2003-02-15 | Hewlett Packard Co | POWER SUPPLY |
DE10124114A1 (en) * | 2001-05-17 | 2002-12-05 | Infineon Technologies Ag | Circuit arrangement for voltage stabilization |
JP4774639B2 (en) * | 2001-06-29 | 2011-09-14 | エプソントヨコム株式会社 | Manufacturing method of surface mount type piezoelectric oscillator |
CN103427683A (en) * | 2013-08-30 | 2013-12-04 | 昆山奥德鲁自动化技术有限公司 | Voltage-stabilizing power circuit |
RU2693182C1 (en) * | 2018-09-17 | 2019-07-01 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Univibrator |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2239718A1 (en) * | 1973-08-02 | 1975-02-28 | Itt | |
DE2700111A1 (en) * | 1977-01-04 | 1978-07-13 | Dietrich Dipl Ing Jungmann | Automatic stabilising circuit for DC voltages - has error signal amplifier with positive feedback with loop gain of one |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4327319A (en) * | 1980-08-15 | 1982-04-27 | Motorola, Inc. | Active power supply ripple filter |
FR2536921A1 (en) * | 1982-11-30 | 1984-06-01 | Thomson Csf | LOW WASTE VOLTAGE REGULATOR |
US4560918A (en) * | 1984-04-02 | 1985-12-24 | Rca Corporation | High-efficiency, low-voltage-drop series regulator using as its pass element an enhancement-mode FET with boosted gate voltage |
-
1987
- 1987-02-23 IT IT19450/87A patent/IT1203335B/en active
-
1988
- 1988-02-23 EP EP88301542A patent/EP0280514B1/en not_active Expired
- 1988-02-23 DE DE8888301542T patent/DE3861520D1/en not_active Expired - Fee Related
- 1988-02-23 JP JP63038759A patent/JP2505846B2/en not_active Expired - Fee Related
- 1988-02-23 US US07/159,290 patent/US4801860A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2239718A1 (en) * | 1973-08-02 | 1975-02-28 | Itt | |
DE2700111A1 (en) * | 1977-01-04 | 1978-07-13 | Dietrich Dipl Ing Jungmann | Automatic stabilising circuit for DC voltages - has error signal amplifier with positive feedback with loop gain of one |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0316781A1 (en) * | 1987-11-17 | 1989-05-24 | National Semiconductor Corporation | Dual input low dropout voltage regulator |
EP0376665A1 (en) * | 1988-12-28 | 1990-07-04 | STMicroelectronics S.r.l. | Voltage stabilizer |
EP0490432A1 (en) * | 1990-12-11 | 1992-06-17 | Koninklijke Philips Electronics N.V. | Power-supply arrangement |
EP0501418A2 (en) * | 1991-02-27 | 1992-09-02 | STMicroelectronics S.r.l. | Low-fall voltage regulator |
EP0501418A3 (en) * | 1991-02-27 | 1993-04-21 | Sgs-Thomson Microelectronics S.R.L. | Low-fall voltage regulator |
EP0731553A2 (en) * | 1991-09-30 | 1996-09-11 | Siemens Aktiengesellschaft | Active harmonic suppressor |
EP0731553A3 (en) * | 1991-09-30 | 1996-09-18 | Siemens Ag | |
EP0556663A1 (en) * | 1992-02-07 | 1993-08-25 | Power Integrations, Inc. | Below ground current sensing with current input to control threshold |
US5578960A (en) * | 1992-09-30 | 1996-11-26 | Sharp Kabushiki Kaisha | Direct-current stabilizer |
EP0590764A1 (en) * | 1992-09-30 | 1994-04-06 | Sharp Kabushiki Kaisha | Direct-current stabilizer |
EP0693784A1 (en) * | 1994-06-24 | 1996-01-24 | STMicroelectronics S.r.l. | Safeguard for integrated output power stages employing multiple bond-wires |
US5635822A (en) * | 1994-06-24 | 1997-06-03 | Sgs-Thomson Microelectronics, S.R.L. | Safeguard for integrated power stages employing multiple bond-wires to a current lead of the package |
GB2325313B (en) * | 1997-05-12 | 2001-06-13 | Fulleon Ltd | Electronic circuits |
GB2325313A (en) * | 1997-05-12 | 1998-11-18 | Fulleon Ltd | Electronic circuits for removing data signals from DC supply voltage |
GB2346226A (en) * | 1999-01-26 | 2000-08-02 | Nec Corp | Constant voltage power supply |
US6194873B1 (en) | 1999-01-26 | 2001-02-27 | Nec Corporation | Power source supplying circuit and method comprising a constant-voltage control arrangement |
GB2346226B (en) * | 1999-01-26 | 2003-06-18 | Nec Corp | Power source supplying circuit and method comprising a constant-voltage control arrangement |
AT500518A1 (en) * | 2000-05-25 | 2006-01-15 | Hilti Ag | DEVICE AND METHOD FOR GENERATING HIGH VOLTAGE FROM A LOW VOLTAGE SUPPLY SOURCE |
WO2009044326A1 (en) * | 2007-09-30 | 2009-04-09 | Nxp B.V. | Capless low drop-out voltage regulator with fast overvoltage response |
US8648578B2 (en) | 2007-09-30 | 2014-02-11 | Nxp, B.V. | Capless low drop-out voltage regulator having discharge circuit compensating for on-chip output capacitance and response time |
US7928711B2 (en) | 2007-12-11 | 2011-04-19 | Texas Instruments Deutschland Gmbh | Linear voltage regulator with accurate open load detection |
RU2480809C1 (en) * | 2011-10-13 | 2013-04-27 | Открытое акционерное общество "Концерн "Созвездие" | Dc voltage stabiliser |
CN105511544A (en) * | 2016-01-15 | 2016-04-20 | 中山芯达电子科技有限公司 | Adjustable voltage stabilizing circuit |
Also Published As
Publication number | Publication date |
---|---|
JP2505846B2 (en) | 1996-06-12 |
US4801860A (en) | 1989-01-31 |
EP0280514B1 (en) | 1991-01-16 |
IT8719450A0 (en) | 1987-02-23 |
IT1203335B (en) | 1989-02-15 |
DE3861520D1 (en) | 1991-02-21 |
JPS6438812A (en) | 1989-02-09 |
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